remctl up to 3.13 remctld use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.8$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in remctl up to 3.13. This vulnerability affects unknown code of the component remctld. Performing a manipulation results in use after free. This vulnerability is cataloged as CVE-2018-0493. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability classified as critical has been found in remctl up to 3.13. This affects some unknown processing of the component remctld. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

remctld in remctl before 3.14, when an attacker is authorized to execute a command that uses the sudo option, has a use-after-free that leads to a daemon crash, memory corruption, or arbitrary command execution.

The bug was discovered 03/30/2018. The weakness was shared 04/03/2018 (Website). The advisory is shared at debian.org. This vulnerability is uniquely identified as CVE-2018-0493 since 11/27/2017. The exploitability is told to be easy. It is possible to initiate the attack remotely. Required for exploitation is a authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108771 (Debian DSA-4159-1 : remctl - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176341 (Debian Security Update for remctl (DSA 4159-1)).

Upgrading to version 3.14 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.eyrie.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (108771). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.2
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 108771
Nessus Name: Debian DSA-4159-1 : remctl - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 830053
OpenVAS Name: Debian Security Advisory DSA 4159-1 (remctl - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: remctl 3.14
Patch: 86c7e44090c988112a37589d2c7a94029eb5e641

Timelineinfo

11/27/2017 🔍
03/30/2018 +123 days 🔍
04/01/2018 +2 days 🔍
04/02/2018 +1 days 🔍
04/03/2018 +1 days 🔍
04/03/2018 +0 days 🔍
04/03/2018 +0 days 🔍
02/26/2023 +1790 days 🔍

Sourcesinfo

Advisory: debian.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-0493 (🔍)
GCVE (CVE): GCVE-0-2018-0493
GCVE (VulDB): GCVE-100-115569

OVAL: 🔍

Entryinfo

Created: 04/03/2018 15:39
Updated: 02/26/2023 10:11
Changes: 04/03/2018 15:39 (73), 01/20/2020 19:23 (2), 02/26/2023 10:11 (4)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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